This experiment evaluates the effect of Barley Green in patients with hyperuricemia ， and explores the effect of Barley Green on metabolic indexes such as uric acid, blood lipids, blood glucose, free fatty acids。130 adult participants , age 18 to 65 years, will be randomized into one of the two arms. Arm A (control group) will receive dietary guidance. Arm B will receive dietary guidance and Barley Green.

Inclusion Criteria:

• Age 18-65 years old those who are willing to accept assessment and sign informed consent.
• Under the normal purine diet, two fasting blood uric acid levels on different days: 420umol/l <blood uric acid <540 umol/l (male), 360 umol/l <blood uric acid <540 umol/l (female)

Exclusion Criteria:

• Patients currently receiving treatment for hyperuricemia；
• Suffering from diseases that affect the digestion and absorption(such as chronic diarrhea, constipation, severe gastrointestinal inflammation, active gastrointestinal ulcers, after gastrointestinal resection, cholecystitis/cholecystectomy, etc.)；
• Suffering from cardiovascular and cerebrovascular diseases, grade 3 hypertension, chronic hepatitis, malignant tumors, anemia, mental illness and memory disorders, epilepsy and other diseases;
• At the same time receive other functional food nutrition support (plant active substances, health food);
• Patients with abnormal liver function (alanine aminotransferase or/and aspartate aminotransferase exceeds 3 times the upper limit of normal value); patients with abnormal renal function (serum creatinine exceeds the upper limit of normal value)；
• Suffering from infectious diseases such as active tuberculosis and AIDS;
• People who are severely allergic to the ingredients of research；
• During pregnancy or lactation;
• Patients with physical disabilities and clinicians think it is not suitable to participate in the study (for example, suffering from serious diseases not included in the discharge criteria)；
• Gouty arthritis attack ≥ 2 times;
• One episode of gouty arthritis with blood uric acid >480 umol/l, or any of the following: age <40 years old, evidence of gout stone or urate deposition in the joint cavity, uric acid nephrolithiasis or renal impairment (GFR≤89ml/(min·1.73m2)), hypertension, impaired glucose tolerance or diabetes, dyslipidemia, obesity, coronary heart disease, stroke, cardiac insufficiency;
• Blood uric acid>480 umol/l combined with any of the following: uric acid nephrolithiasis or renal impairment (GFR≤89ml/(min·1.73m2)), hypertension, impaired glucose tolerance or diabetes, dyslipidemia, obesity, Coronary heart disease, stroke, heart failure.